大渡河猴子岩水电站影响区域维管植物区系组成及特征

Analysis on Floristic Composition and Characteristics of Vascular Plants in Houziyan Hydropower Station Impacted Regions on Dadu River

【目的】在对大渡河猴子岩水电站影响区域内维管植物进行详细调查和鉴定的基础上,对区域内植物区系的组成和特征进行分析研究。【方法】采取样线法和样方法相结合的方式对区域内维管植物的种类进行调查,根据中国种子植物分布区类型的划分标准,对区域内植物科、属的区系地理成分进行统计和分析。【结果】1)区系中有维管植物87科279属537种,物种多样性较为突出。2)寡种科和单种属、寡种属是植物区系的主体,区系组成结构较为复杂;大科、寡种属在植物种类组成上表现出优势,分别占物种总数的33.27%,47.44%。3)蕨类植物在科和属的区系成分中,世界分布成分均为优势类型,分别占总科数的66.67%和总属数的60%。4)种子植物在科的区系组成中呈现出较高的热带性质,在属的区系组成中呈现出温带性质和热带性质。5)在属的水平上,区系组成中含有一定量的中国特有成分。【结论】建议在水电站施工期间以及工程后期应当采取相应的迁地保护、移栽育苗和植被恢复等措施,减轻对植物的破坏和对生态环境的破坏。

[Purposes]Based on the detailed investigation and species identification about vascular plants m Houzlyan hyclropower station impacted regions on Dadu river, the floristic composition and Characteristics in the region were analyzed. [Methods]Take the line-intercept method and quadrat sampling method to investigate the species of regional vascular plants, according to the classification standard of the distribution type of Chinese seed plants, statistics and analysis the geographical elements of regional plant families and genera. [Findings]1 ） This area contains 537 vascular plant species, which belong to 87 families and 279 genera. The species diversity is prominent. 2） The few-species family, the single-species genera and few-species genera are the main part of the flora, and the structure of flora is relatively complex. The dominance of the few-species genera and the plurimotypic family is evident in species composition, which accounted for 33.27% and47.44% of the total species respectively. 3） In the fern flora, the cosmopolitan element gained domination both on the family level and genus level, occupying 66.67% and 60% of the total number of families and genera respectively. 4） The distribution types are mainly tropical components on the family level, while the distribution types are mainly temperate and tropical components on the genus level of seed plants. 5） On the genus level, the flora was characterized with certain Chinese peculiar elements. [Conclusions] It is suggested that in the late and during the period of construction of hydropower stations, some measures should be taken, such as ex-situ conservation, transplanting seedlings and vegetation restoration to mitigate the damage to the plants and the ecological environment.